Introduction - If you have any usage issues, please Google them yourself
basic knowledge
Draw rectangle
Clear rectangular area
Arc
path
Draw a line segment
Drawing Bezier curves
Linear gradient
Radial gradient (diverging)
Graphic distortion (translation, rotation, scaling)
Matrix transformation (mechanism of graphic deformation)
Graphic combination
Draw a shadow on the graphic
Draw an image (picture tile, crop, pixel processing [not just images, including other drawing graphics])
Drawing text
Save and restore state (context)
save document
Create animation with setInterval